The logotype

The logotype is a representation of the Kerberos protocol, the
two parties (client and server) on either side of the trusted
third party (KDC) that binds them together.
The three parts of the logotype are in the shape of key holes
since Kerberos uses cryptographic keys to protect the
exchange.

Why?

We choose the logo because of it uniqueness and that is was
easy to use as an application icon. It just not yet another
round icon in your Applications folder.